2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/231028This contribution, aimed mostly at experimental particle physicists, reviews some of the main ideas and results of String Theory in a non-technical language. It originates from the talks presented by the authors at the Electro-Weak session of the 2002 Moriond Meeting, here merged in an attempt to provide a more complete and concise view of the subject.LaTeX, 28 pages, 13 figures. Contribution to the proceedings of the 2002 Rencontres de Moriond "Electroweak interactions and unified theories"High Energy Physics - ExperimentGeneral Relativity and Quantum CosmologyHigh Energy Physics - Phenomenologytext